Valve-grinder



Iatented June 28, 19231.

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GUSTAV SCHADEE, OF NEW YORK, N. Y.

VALVE- GRINDER.

Application filed February 19, 1920. Serial No. 359,762.

To all whom it may concern:

Be it known that l, G'os'rnv Sol-moan, a citizen of the United States, residing in the borough of Manhattan, city, county, and State of N w York, have invented an Im provement in Valve-Grinders, of which the following is a specification.

This invention relates to a valve grinder and more particularly to an apparatus for grinding the valves of the type 01' internal combustion engines used in motor vehicles. Furthermore, the particular apparatus made in accordance with my present invention is especially adapted for grinding the valves oi the engines used in the Ford motor cars, although, as will be understood, it is not restricted to use in this type of engine.

The object of the present invention is to provide an apparatus which may be set in position and in the use of which the valve grinding tool is turned alternately in one direction and then in the other, and one by which in seating the tool and applying the necessary pressure the valve seat in all instances is uniformly ground. In carrying out the invention, 1 preferably employ a casing having a portion thereof adapted to fit in the open end of an engine cylinder and having an extending portion adapted to overlie the valves of the engine, and within the casing I provide the necessary mechanism, as hereinafter described, for imparting the desirable alternating rotative movement to a valve tool to adequately grind-the valve seat.

In the drawing:

Figure 1 is a central longitudinal cross section of the valve grinding apparatus made in accordance with this invention.

Fig. 2 is a section on line 2-2, Fig. 1, and

F 3 is a diagrammatic plan illustrating an apparatus adapted to simultaneously grind two valve seats.

Referring to the drawing, it will be seen that in carrying out this invention, I employ a casing 10 which may be made of any suitable metal and is preferably provided with a cylindrical bottom 11 of such diameter as to fit snugly into the upper or outer open end of the cylinder of an internal combustion engine. The casing may also be fitted with a suitable cover 12. The

cylindrical bottom of the casing provides a shoulder within the same which serves as a seat for a partition Wall 13 which may be suitably secured within the casing by the screws as indicated, or otherwise. The apparatus also includes a drive shaft is; which is journaled in suitable bearings 15 and 16, the former being provided in the cover 12 and the latter in the wall 01' the bottom 11. Suitably mounted upon or secured to the partition wall 13 is a ring'or band 17. Within this band, I employ a helical spring 18. One end 01 the spring is connected to the band 1'? by a rivet 19 or otherwise, while the opposite or inner end of the spring is connected to the drive shaft i l by a set within the 1%, 1 also screw 20 or otherwise. Mounted casing and upon the drive shaft employ a pulley indicated at 21.

Extending in a suitable position from the casing 10 there is an extension thereof indicated at 22. This is open at its extremity as indicated at 23 and the lower wall of the extension terminates in an upturned end 24. Associated with the extension'22, I employ an adjustable bearing 25. In this adjustable bearing 25 a tool shaft 26 is journaled. This tool shaft 26 passes through slots 27 and 27 provided in the walls of the extension, and the extension is also provided with slots 28 and 29 employed in pairs and through which, as well as through the walls of the adjustable bearing, bolts 30 and 31 are passed in order to lock the adjustable bearing in a desired position, the bearing being adjusted to this position and assisted. in being maintained therein by a screw 32 which passes through the end 2st and also into or through the end wall of the adjustable bearing.

"9n the tool shaft 26 and within the extension of the casing, I employ a pulley 33. Around this pulley 33 a cord or chain is given a predetermined number of turns and one end of this cord or chain 34- is wrapped around the pulley 21 and the extremity of the cord suitably attached to the pulley, while the opposite end of the cord or chain 34 is passed through a tube 35 to the exterior ol' the casing 10. As illustrated, this tube 35 is provided with a flaring end 36 eXteriorly of the casing and the extremity of the cord or chain is fitted with a ring 37 by means of which the cord may be pulled against the action of the spring 18. The lower or inner extremity of the tool shaft 26 is provided with a square end 38 and a yielding longitudinal tension applied to the tool shaft 26 by means of a spring 39 bearing against its upper or outer end or otherwise. The square end of the tool shaft is adapted to be received in a recess in a socket member all) which, by suitable pins or otherwise, may be connected to the spindle 11 of the valve grinding tool.

As hereinbefore stated, the cylindrical bottom 11 of the casing is adapted to fit snugly within the open end of an engine cylinder normally, that is, when the engine and the valve grinding tools are new this fit will be suiiiciently snug to maintain the apparatus in position, but as it is necessary to fix the grinding apparatus in place, include in my invention provisions for looking the same in place after the engine cylin der, as well the cylindrical bottom the casing have become worn. This is done by suitable clamps as illustrated in the drawing, and are operated by a shaft i2 passing through and journaled in the wall of the cylindrical bottom and the cover of the casing. Exteriorly of the cover this shaft is provided with a handle 43 by which the shaft may be turned. The partition wall 13 provides a chamber within the cylindrical bottom of the casing, this chamber being indicated at a l and within which the clamp operating devices are located. On the shaft 4-2 within this chamber is there is a segmental gear Suitably journaled in a bearing provided therefor in the wall of the bottom 11 there is shaft 46. On this shaft 46 there is secured a cam i? and a gear 48 meshing with the segmental gear 4:5. One the clamp members is indicated (i9. This is provided with a shank and ahead i 51. The clamp member is normally adapted to [it within a recess provided in the cylindrical wall of the bottom 11 with the shank 50 passing through the wall and the clamp is maintained in position in the recess by a spring surrounding the shank 50 and bearing at one end against the head 51 and at the other against the shoulder provided in the wall of the cylindrical bottom. Dia metrically opposed to the clamp 49 is a simi lar clamp s clamp 54; is at the outer end of a shank provided with a spanner portion 56 to extend around the drive shaft 14 and terminating in a hea d 57. The shank is also fitted with a flange 58 and the clamp member 54. is normally n aintained. within its recess in the wall of the cylindrical bottom member by a spring surrounding the shank and extending between the flange and the shoulder 60 forming part of the cylindrical wall of the bottom 11. The cam i7 is so placed on the shaft L6 as to lie between the heads 51 and 557 of the clamp shanks, and as will be apparent, the turning of the shaft 42 will turn the shaft 46 through the gears 4th and 48 and by turning the shaft 46 the cam i7 is operated to force the clamps a9 and 5 1 outwardly against the actions of the springs 52 and '59. In being thus forced outwardly, the

clamps a9 and 5 1 engage the walls of the engine cylinder in which the cylindrical bottom 11 of the apparatus is placed so as to hold and maintain the apparatus rigidly in position for the valve grinding operation.

By referring to Fig. 3 it will be understood that two or more extensions may be provided with a common casing and as many valves ground simultaneously as may be found expedient without departing from the nature and spirit of this invention.

in the operation of the apparatus, the cyl' drical bottom 11 is set and secured in the open end of an engine cylinder with the extension 22 thereof lying over the valves, the valve grinding tool being connected to the tool shaft and the tool shaft adjusted to the proper position for grinding the valve seat. l ilhen this is done, the ring 37 is grasped by the operator and pulled out wardly, thus revolving the drive shaft 14 by unwinding the cord or chain thereon against the action of the spring 18 which is thereby placed under tension. This movement also is transmitted by the same cord or chain the pulley 33, thereby imparting a revolubie movement in one direction to the tool shaft- 26 and the valve grinding tool connected thereto. The ring 37 is then released and the cord or chain permitted to run within the casing, and obviously by the action of the spring 18 the cord or chain is rewound on the pulley 21 and in turn this movement is imparted to the pulley 33 to turn the tool shaft 26 and the valve grinding tool connected thereto in the opposite direction.

lit will be equally obvious that the apparatus hereinbcfore described may be assoeiatwl with tools other than valve grinding tools for example, it may be used in conjunction with a screw driver to advantage in various operations.

I claim as my invention:

in a valve grinding apparatus, a casing, a tool shaft associated therewith, a pulley mounted on the tool shaft within the casing, a drive shaft journaled in hearings in the said casing, a pulley mounted on the drive shaft within the casing, a chain passed around the pulley on the drive shaft and also around the pulley on the tool shaft and extending at one end to a position exteriorly of the casing, and a spring associated with the said drive shaft whereby when the said chain is pulled exteriorlv of the casing the tool shaft is revolved in one direction and a tension applied to the spring and upon re leasing the chain the spring is employed to drive the tool shaft in the opposite direction.

Signed by me this 2nd day of February,

GUSTAV SGHADEE. 

